CN110685660B - Device and method for realizing accurate control of concentration of sand-carrying fluid in proppant conveying experiment - Google Patents
Device and method for realizing accurate control of concentration of sand-carrying fluid in proppant conveying experiment Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002474 experimental method Methods 0.000 title claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 78
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 230000000007 visual effect Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 13
- 238000007667 floating Methods 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000012800 visualization Methods 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/28—Safety arrangements; Monitoring
Abstract
The invention relates to a device and a method for accurately controlling the concentration of sand-carrying fluid in proppant conveying experiments. The device comprises a fracturing fluid tank 1, a screw pump 2, a diversion tee joint 16, a closed sand mixing tank 19, a sliding vane pump 7, a sand feeding tank 6, a confluence tee joint 18, a simulated shaft 20, a visual flat crack 10 and a camera 21. The method comprises the following steps: fixing the visualized flat crack on a support to form a vertical crack; starting a screw pump, and dividing the fracturing fluid into an upward flow part and a forward flow part at a dividing tee joint; the fracturing fluid flowing upwards enters a closed sand mixing tank, and the fracturing fluid and the propping agent are mixed in the sand mixing tank to form sand carrying fluid; the fracturing fluid which is split forwards is fully mixed with sand carrying fluid in the sand mixing tank at a confluence tee joint; and pumping the fully mixed sand-carrying fluid into the flat crack through the simulated wellbore. The invention has reliable principle and simple and convenient operation, greatly improves the accuracy of the experiment, and ensures that the proppant conveying and laying optimization result has more on-site guiding significance.
Description
Technical Field
The invention relates to an experimental device and method for accurately controlling the concentration of sand-carrying fluid in proppant conveying experiments, and belongs to the field of oil and gas field development.
Background
Hydraulic fracturing is to utilize a high-pressure pump set to inject a fracturing liquid pump into a stratum, and to press open an oil and gas reservoir when the fracturing pressure of the stratum is exceeded, so that the oil and gas productivity is released, the oil and gas recovery ratio is improved, and the yield increasing effect is achieved. After the pump is stopped at the ground, the artificial fracture is closed due to formation pressure, so that after the reservoir is fractured, proppant particles are injected to enable the fractured fracture to still keep a certain opening degree, and the fracture of the formation can keep a certain diversion capacity. Therefore, the migration and the laying of the propping agent particles in the cracks greatly influence the final yield increase effect, and the research on the migration rule of the propping agent in the cracks has great significance for guiding hydraulic fracturing construction.
At present, the proppant migration in the hydraulic fracturing process is studied mainly by utilizing a large-scale visual plate experiment means, and the movement rule of the proppant is studied by pumping the sand-carrying fluid containing the proppant into the visual plate fracture and further observing the proppant conveying process in the plate fracture. Chinese patent application CN106151833a discloses a device and method for evaluating sand carrying effect of fracturing fluid, wherein the device is prepared in advance with sand carrying fluid, and then the sand carrying fluid is directly conveyed to a flat crack through an injection pump and a pipeline. In the process, particularly in experiments for simulating shale slickwater to convey propping agents, due to the fact that the viscosity of slickwater is low, the propping agents can be settled to a certain extent in the multiphase mixing conveying pump, so that the concentration of the propping agents entering the flat plate cannot be kept at a stable value, the test precision of the experiments is affected, and finally the optimal research result of the propping agent conveying is affected. In 2016 Songang Tong et al (Proppant transport study in fractures with intersections J. Fuel,2016, 181:463-477) an experimental device for directly conveying a fracturing fluid without a mixing pump is disclosed, and the device enables a propping agent and a fracturing fluid to be mixed at a crack entrance, and injection of the fracturing fluid is realized only by gravity, so that a working condition with smaller pressure can be simulated, and meanwhile, a sand mixing tank is not kept airtight, so that air enters a flat crack and the proppant conveying process is disturbed.
Disclosure of Invention
The invention aims to provide a device for accurately controlling the concentration of sand-carrying fluid in a proppant conveying experiment, which is characterized in that a diversion pipeline is arranged behind a screw pump, uniform sand feeding is realized through a closed sand mixing tank, and the concentration of the sand-carrying fluid is accurately controlled by adjusting the flow of the confluence pipeline, so that the proppant is prevented from settling when the sand-carrying fluid passes through the mixed conveying pump, and air is prevented from entering a flat crack, the accuracy of the experiment is greatly improved, and the proppant conveying and paving optimization results have more on-site guiding significance.
The invention also aims to provide a method for accurately controlling the concentration of the sand-carrying fluid in the proppant conveying experiment by using the device, which has the advantages of reliable principle and simple and convenient operation, and can effectively avoid the problem that the experimental conditions cannot be accurately controlled due to the sedimentation of proppant particles in a pump while meeting the experimental test requirements of proppant conveying and laying in the simulated hydraulic fracture.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The device for realizing accurate control of the concentration of the sand-carrying fluid in the proppant conveying experiment comprises a fracturing fluid tank, a screw pump, a flowmeter, a diversion tee joint, a closed sand mixing tank, a confluence tee joint, a simulated shaft, a visualized flat crack, a waste fluid tank, an adjusting valve, a pressure gauge and a camera.
The fracturing fluid tank is used for preparing pure fracturing fluid used for experiments and is directly connected with a screw pump of the power equipment through a pipeline. After the fracturing fluid is pressurized by the screw pump, the flow of the fracturing fluid is measured by the flowmeter and is regulated by the valve. The pump is connected with a three-way pipeline, fluid is split into an upward flowing part and a forward flowing part, the upward flowing fluid enters the closed sand mixing tank from the liquid inlet, and the flow entering the closed sand mixing tank is controlled by a valve.
The closed sand mixing tank mainly comprises a water quantity maintaining device and a uniform sand feeding device.
The water quantity holding device consists of a floating ball, a fixed rod, a lever and a waterproof gasket. In the early stage of injection, the liquid level in the sand mixing tank is low, the water-proof gasket does not seal the liquid inlet under the gravity action condition, and the fracturing fluid can smoothly enter the tank; with the rising of the liquid level, the floating ball moves upwards under the buoyancy action, the water-proof gasket seals the liquid inlet through the lever, and the fracturing liquid which is split upwards does not enter any more; as the experiment proceeds, the liquid level in the tank will drop slightly, and the water inlet will be opened again; by this circulation, the water level in the closed sand mixing tank can be ensured to keep dynamic balance.
The uniform sand feeding device consists of a sand feeding tank and a sliding vane pump. The propping agent is added into the sand inlet tank, and the sand amount entering the sand mixing tank is accurately controlled by adjusting the rotating speed of the sliding vane pump. The propping agent is mixed with the fracturing fluid to form sand-carrying fluid after entering the tank, the sand-carrying fluid is settled downwards under the action of gravity, and finally all propping agent particles entering the tank are injected into the main pipeline through the pipeline at the bottom of the tank and are converged with upstream forward-split fluid at the tee joint.
The fluid diverted forward will pass through a converging nozzle before converging with the upper carrier fluid, where it will form a high velocity jet, so that the negative pressure created can better draw down the carrier fluid for thorough mixing. The total flow of the converging pipeline is the same as the total flow of the pipeline before diversion, so that the proppant concentration of the sand-carrying fluid can be obtained and accurately controlled by combining the sand adding amount. And (3) pumping the sand-carrying fluid into the flat plate under the condition of keeping the concentration of the propping agent constant, and measuring the pressure of the whole pumping flow by a pressure gauge. And injecting the converged sand-carrying fluid system into the flat crack through the simulated shaft, observing the sand-carrying fluid conveying process through a camera, and finally flowing the fluid into the waste liquid tank.
The method for accurately controlling the concentration of the sand-carrying fluid in the proppant conveying experiment by using the device comprises the following steps in sequence:
(1) Fixing the visualized flat crack on a support to form a vertical crack;
(2) Filling the prepared fracturing fluid into a fracturing fluid tank, and adding a propping agent into a sand inlet tank;
(3) Starting a screw pump, and dividing the fracturing fluid into an upward flow part and a forward flow part at a dividing tee joint;
(4) The fracturing fluid flowing upwards enters a closed sand mixing tank from a fluid inlet, the sand mixing tank keeps fluid quantity through a floating ball, a fixed rod, a lever and a waterproof gasket, the sand inlet accurately controls the supporting dosage of the fracturing fluid entering the sand mixing tank by adjusting the rotating speed of a sliding vane pump, and the fracturing fluid and the supporting agent are mixed in the sand mixing tank to form sand carrying fluid;
(5) The fracturing fluid which is branched forwards forms high-speed jet flow at the convergent nozzle, negative pressure is generated to suck sand-carrying fluid in the sand mixing tank above to be fully mixed at the confluence tee joint;
(6) Pumping the fully mixed sand-carrying fluid into the flat crack through the simulated shaft, measuring the pressure in the whole pumping process by a pressure gauge, monitoring the conveying process of the sand-carrying fluid through a camera, and finally flowing the fluid into the waste liquid tank.
Compared with the prior art, the invention has the beneficial effects that: in the proppant conveying experiment process, the proppant is prevented from settling when the sand-carrying fluid passes through the mixing and conveying pump, uniform sand feeding and accurate control of the concentration of the sand-carrying fluid can be realized, and meanwhile, air can be prevented from entering a flat crack, so that the experiment accuracy is greatly improved, and the proppant conveying and paving optimization result has more on-site guidance significance.
Drawings
Fig. 1 is a schematic diagram of a device structure for realizing accurate control of the concentration of sand-carrying fluid in a proppant conveying experiment.
Fig. 2 is a schematic diagram of a closed sand carrying tank.
In the figure: 1. fracturing fluid tanks; 2. a screw pump; 3. a waterproof gasket; 4. a fixed rod; 5. a lever; 6. feeding sand into a sand tank; 7. a sliding vane pump; 8. a floating ball; 9. a pressure gauge; 10. visualizing the flat crack; 11. a waste liquid tank; 12. adjusting a valve; 13. a pump front line; 14. a post-pump line; 15. a flow meter; 16. a shunt tee; 17. a reducing nozzle; 18. a confluence tee; 19. a closed sand mixing tank; 20. simulating a wellbore; 21. a camera; 22. a liquid inlet.
Detailed Description
The invention is further described below with reference to the drawings and examples to facilitate an understanding of the invention by those skilled in the art. It should be understood that the invention is not limited to the precise embodiments, and that various changes may be effected therein by one of ordinary skill in the art without departing from the spirit or scope of the invention as defined and determined by the appended claims.
See fig. 1 and 2.
The device for realizing accurate control of the concentration of the sand-carrying fluid in the proppant conveying experiment comprises a fracturing fluid tank 1, a screw pump 2, a diversion tee joint 16, a closed sand mixing tank 19, a sliding vane pump 7, a sand inlet tank 6, a confluence tee joint 18, an analog shaft 20, a visual flat crack 10, a waste liquid tank 11 and a camera 21.
An adjusting valve 12 is arranged on a front pump pipeline 13 connected with the screw pump 2 of the fracturing fluid tank 1, a flowmeter 15 is arranged on a rear pump pipeline 14 connected with a shunt tee 16 of the screw pump, the shunt tee is connected with a liquid inlet 22 of a closed sand mixing tank 19 upwards through a pipeline, and the shunt tee 18 is connected with a confluence tee 18 forwards through a pipeline; the top end of the sand mixing tank is connected with a sliding vane pump 7 and a sand inlet tank 6; the fracturing fluid in the fracturing fluid tank enters the sand mixing tank through a fluid inlet, propping agent in the sand inlet enters the sand mixing tank through a sliding vane pump, and sand carrying fluid is formed after the fracturing fluid and the propping agent are mixed; the confluence tee is connected with an outlet of the tank bottom of the sand mixing tank upwards through a pipeline, and is connected with a visualized flat crack 10 and a waste liquid tank 11 in the simulated shaft 20 forwards through a pipeline (the pipeline is provided with a pressure gauge 9); the camera 21 monitors the sand-carrying fluid conveying process of the visualized flat cracks.
The closed sand mixing tank keeps liquid amount through the floating ball 8, the fixed rod 4, the lever 5 and the waterproof gasket 3, the lever is fixed by the fixed rod, the waterproof gasket and the floating ball are respectively arranged at two ends of the lever, fracturing liquid enters the tank through the liquid inlet, the floating ball moves upwards along with the rising of the liquid level to a certain height, and the liquid inlet is sealed by the waterproof gasket through the lever.
The sand inlet tank accurately controls the supporting dosage of the sand mixing tank by adjusting the rotating speed of the sliding vane pump.
The pipeline of the shunt tee joint connecting the confluence tee joint is provided with a reducing nozzle 17, fluid forms high-speed jet flow through the reducing nozzle, and the generated negative pressure sucks sand-carrying fluid in the sand mixing tank down to be fully mixed at the confluence tee joint.
The visual plate crack device capable of realizing three-dimensional flow field test is characterized in that the visual plate crack device (Zhang Tao and the like; application number: 2019100874395) consists of a plurality of sections of flow channels (more than two sections), each section of flow channel comprises two transparent plates and two frames, the two transparent plates are respectively inlaid in the two frames and are arranged in parallel, a narrow flow gap is formed in the middle of the two transparent plates, and the upper end and the lower end of the gap are sealed by surrounding frames. Every two sections of flow channels are connected through bolts, so that a crack channel with adjustable length is formed, and the left end and the right end of the whole flat crack are connected with the simulated shaft.
The method for accurately controlling the concentration of the sand-carrying fluid in the proppant conveying experiment by using the experimental device comprises the following steps:
1. all parts of the device are installed and connected in sequence as shown in fig. 1 and 2;
2. fixing the assembled flat crack on a support to form a vertical crack;
3. about 300 percent L of clear water is injected into the water distribution tank, a valve is opened, a pump is started, the sealing performance of the system is checked, the liquid level in the sand mixing tank is ensured to be higher than the liquid inlet, and the water-proof gasket can seal the liquid level in the sand mixing tank;
4. 300L fracturing fluid is arranged in a fracturing fluid tank;
5. the screw pump is operated, the clean water in the pipeline and the cracks is discharged by using the fracturing fluid, so that the whole device system is filled with the fracturing fluid, and the flow is regulated by the valve to achieve the experimental working condition;
6. starting a sliding vane pump, and regulating the rotating speed to enable the sliding vane pump to meet the sand-carrying fluid concentration requirement required by an experiment;
7. adding a propping agent into the sand feeding tank;
8. starting a camera system, and shooting the process of proppant conveying and sedimentation;
9. recording data such as flow, pressure and the like;
10. after shooting is completed, the pump and the valve are closed, and the experiment is stopped.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the spirit of the invention described herein, either as described above or as a result of the knowledge or skill of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (4)
1. The method for realizing accurate control of the concentration of sand-carrying fluid in proppant conveying experiments by using a device comprises a fracturing fluid tank (1), a screw pump (2), a diversion tee joint (16), a closed sand mixing tank (19), a sliding vane pump (7), a sand inlet tank (6), a confluence tee joint (18), a simulated shaft (20), a visual flat crack (10), a waste fluid tank (11) and a camera (21), wherein an adjusting valve (12) is arranged on a pre-pump pipeline (13) connected with the fracturing fluid tank (1) and the screw pump (2), a flowmeter (15) is arranged on a post-pump pipeline (14) connected with the screw pump and the diversion tee joint (16), and the diversion tee joint is connected with a liquid inlet (22) of the closed sand mixing tank (19) through a pipeline upwards and is connected with the confluence tee joint (18) through a pipeline forwards; the top end of the closed sand mixing tank is connected with a sliding vane pump (7) and a sand inlet tank (6), fracturing fluid in the fracturing fluid tank enters the closed sand mixing tank through a fluid inlet, propping agent in the sand inlet tank enters the closed sand mixing tank through the sliding vane pump, and sand carrying fluid is formed after the fracturing fluid and the sand carrying fluid are mixed; the closed sand mixing tank is characterized in that the liquid amount is kept by a floating ball (8), a fixed rod (4), a lever (5) and a waterproof gasket (3), the lever is fixed by the fixed rod, the waterproof gasket and the floating ball are respectively arranged at two ends of the lever, fracturing fluid enters the tank through a liquid inlet, the floating ball moves upwards along with the rising of the liquid level to a certain height, and the liquid inlet is sealed by the waterproof gasket through the lever; the confluence tee joint is connected with an outlet of the tank bottom of the closed sand mixing tank upwards through a pipeline, and is connected with a visualized flat crack (10) and a waste liquid tank (11) in the simulated shaft (20) forwards through a pipeline, and a pressure gauge (9) is arranged on the pipeline; the method for monitoring the sand-carrying fluid conveying process of the visualized flat crack by the camera (21) sequentially comprises the following steps of:
(1) Fixing the visualized flat crack on a support to form a vertical crack;
(2) Filling the prepared fracturing fluid into a fracturing fluid tank, and adding a propping agent into a sand inlet tank;
(3) Starting a screw pump, and dividing the fracturing fluid into an upward flow part and a forward flow part at a dividing tee joint;
(4) The fracturing fluid flowing upwards enters the sealed sand mixing tank from the liquid inlet, the sealed sand mixing tank keeps liquid quantity through the floating ball, the fixed rod, the lever and the waterproof gasket, the supporting dosage of the fracturing fluid entering the sealed sand mixing tank is accurately controlled by adjusting the rotating speed of the sliding vane pump, and the fracturing fluid and the supporting agent are mixed in the sealed sand mixing tank to form sand carrying fluid;
(5) The fracturing fluid which is branched forwards forms high-speed jet flow at the convergent nozzle, negative pressure is generated to suck sand-carrying fluid in the upper closed sand mixing tank, and the sand-carrying fluid is fully mixed at the confluence tee joint;
(6) Pumping the fully mixed sand-carrying fluid into the flat crack through the simulated shaft, measuring the pressure in the whole pumping process by a pressure gauge, monitoring the conveying process of the sand-carrying fluid through a camera, and finally flowing the fluid into the waste liquid tank.
2. The method of claim 1, wherein the sand feed tank accurately controls the amount of support into the closed sand mixing tank by adjusting the rotational speed of the sliding vane pump.
3. The method of claim 1, wherein the split tee is connected to a converging tee with a reducing nozzle (17) on the pipeline, the fluid passing through the reducing nozzle to form a high-speed jet, and the negative pressure generated sucks the sand-carrying fluid in the closed sand mixing tank to be fully mixed at the converging tee.
4. The method of claim 1, wherein the visualization plate crack is formed by a plurality of sections of flow channels, each section of flow channel comprises two transparent plates and two frames, the two transparent plates are respectively embedded in the two frames and are arranged in parallel, a narrow flow gap is formed in the middle, the upper end and the lower end of the gap are sealed, each two sections of flow channels are connected through bolts to form a crack channel with adjustable length, and the left end and the right end of the whole plate crack are connected with the simulated wellbore.
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| CN201911060697.0A CN110685660B (en) | 2019-11-01 | 2019-11-01 | Device and method for realizing accurate control of concentration of sand-carrying fluid in proppant conveying experiment |
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| CN201911060697.0A CN110685660B (en) | 2019-11-01 | 2019-11-01 | Device and method for realizing accurate control of concentration of sand-carrying fluid in proppant conveying experiment |
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| CN111810145B (en) * | 2020-07-24 | 2023-07-07 | 中联煤层气有限责任公司 | Experimental device for simulating coal dust carried in deep coal seam shaft |
| CN112067446A (en) * | 2020-08-10 | 2020-12-11 | 中国石油大学(华东) | Device and method for testing pressure blocking effect of seam height control agent |
| CN113041933B (en) * | 2021-03-09 | 2022-03-08 | 西南石油大学 | Device and method for keeping particle concentration stable in proppant velocity measurement experiment |
| CN115434682A (en) * | 2021-06-04 | 2022-12-06 | 中国石油天然气股份有限公司 | Invariable sand carrying liquid and sand proportioning device for fracturing |
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